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1) The timer replaces one of the 3-way switches. The other 3-way switch remains, but must be rewired.2) The timer must replace the 3-way switch that receives power from breaker box. It cannot replace the other 3-way switch. This is because the timer Black wire must always receive power.3) The timer blue wire must connect to Load (light)4) The ST01C red wire is only used when wiring for 3-way.5) When the red wire and blue wire are connected together, they reverse the timer program. When timer red and blue are disconnected, the timer resumes programming. Connecting and disconnecting the red and blue wires is how the timer mimics 3-way operation.6) The remaining 3-way switch must be wired so it will connect and disconnect the red and blue timer wires. So the remaining 3-way switch has to be rewired to meet specific timer wiring.

This is if you have gas furnace and central air conditioning.
Normally this is the way.
Red wire to R (or if your stat has Rc and Rh, wire to both of these
White wire to W
Green wire to G
Yellow wire to Y
Blue wire to C
If you want to check, before you connect to stat. Connect red and white (heat should come on)
the connect red and green (blower should come on) Normally yellow is for air conditioning and Blue is common DO NOT CONNECT ANY WIRE DIRECTLY TO BLUE, if blue is common it would short out fuse

Intermatic battery-operated timer with red, blue, black and greenGreen connects to bare groundRed is capped off.Blue connects to one wireBlack connects to other wirePush on-off button: if light comes on, timer wiring is correct.If light does not come on, then reverse blue and black wires.

Other in-wall timers except Aube have red, black, white and greenGreen goes to bare groundRed connects to one wireBlack connects to other wire.White: in back of electrical box are white wires twisted together and covered with wire nut. Connect white white to these other white wires.If box does not have white wires described above, then connect white wire to bare ground along with green wire.Push on-off or override switch: if light comes on, timer wiring is correct.
If light does not come on, then reverse red and black wires.

If I understand correctly, you are replacing a switch with the EJ500 timer.You mention a 'plug'

The EJ500 has 3 wires: Black Red Blue.If you are replacing a single-pole switch:The switch has 2 wires, one of these wires is the Hot-from-breaker and the other wire goes to Load:Timer-black connects to Hot-from-breaker.Timer-blue connects to wire-going-to-Load.Timer-red wire is capped off. Red is not used for single pole switch.If you connect wires and your lights blink, then you put the red wire where the blues wire should go.If you connect wires and lights do not operate, try reversing the blue and black wires.

If you are replacing a 3-way switch, the wiring is more complicated.The EJ500 can not replace a 3-way switch wire-for-wire.Diagrams on link above show wiring for 3-way.Add a comment if you need more help.

OK .. the thick black and white are the power for the fan , are there also white wires on the lamp sockets ..??
The thick black wire should connect to the black wire on the switch.
The small black wires connect to the red and blue wire on the switch .. two small black wires each .. that should give you a position for 2 lights , and 4 lights, on the step switch .. but there should be white wires from the lamp sockets connected to the thick white from the fan .

the wiring on the gear box is connected to switches wrong, there bullet head connectors red to red wiring and blue to blue from switch to loom is correct
both wires on one switch are red connect these to the 2 red wires one has colour trace on it also. the other switch blue wires to blue wire on loom with possibly another colour wire but they are together. you cant go wrong the connectors are male on one wire and female on the other on each switch(detent switch)

1. connect the red wire to the stop lamp switch lead on the brake control. Connect the other end of red wire to the stop lamp switch in the vehicle using the splice connector

2. connect the blue wire to the trailer brake lead on the brake control. Route the other end of the blue wire to the trailer connector at the back of the vehicle.

3. connect the white wire to the ground lead on the brake control. Route the other end of the white
wire to the vehicle’s battery. Use the ring connector to connect the white wire to the battery’s negative terminal.

4. connect the black wire to the power lead on the brake control. Route the other end of the black wire to the vehicle’s battery. Use the fuse assembly to connect the black wire to the battery’s positive terminal.